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I'm trying to keep ssh access working without a password, using key authentication. I spent a lot of time looking for solutions until I stumbled across the need to set the home directory . to 711 (and found that 755 also works) but that 777 will not allow key authentication. I set my home directory . to 755 and it works as expected. However, after about 24 hours I'd say, the permission gets set back to 777 and I can't figure out why this is happening. Is this an expected behaviour? What is setting these permissions back to 777?